Brace for holding bits or other tools



(No Model.)

J. T. PEDERSEN.

BRAOE FOR HOLDING BITS OR. OTHER TOOLS. No. 392,062.

Patented Oet. 80, 1888.

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n'rnrv'r tricem AMERICAN BIT-BRAOE COMPANY, OF BUFFALO, NEV YORK.

BRACE FOR HOLDING BITS OR OTHER TOOLS.

SPECIFICATION forming part of Letters Patent No. 392,062, dated October3D, 1888. Application filed January 6, 1888. Serial No. 259.967. (Nomodel.)

To all whom z5 may concern:

Beit known that I, JoriANNns TH. FEDER- snN, ofBi-ooklyn, in the countyof Kings and State of New York, have invented an Improvement in Bracesfor Holding Bits or other Tools, of which the following is aspecification.

Braces forbits have heretofore been constructed with a crank-shapedhandle and a chuck at one end and a presser-head at the other end torest against the person while the brace is being revolved. Inconstructing the chuck portion of the brace the jaws have usuallypbeenheld in place by pins passing through them, and the presser-head hasbeen connected to the crank-handle by a recessed nut.

My invention is made for simplifying the construction ol' the brace andlessening the eir-` pense of the same, and it relates to theconstruction and combination of parts hereinafter setforth.

In the drawings, Figure l shows the brace with the two ends in section.Fig. 2is an elevation of the screw-stock. Fig. 3 shows one of the jawsdetached. Fig. i is a section of the button-head shown in Fig. l. Figs.5 and 6 are sections ofthe button-head in a slightlymodified form. Fig.7 is an end view of the button-head, and Fig. S is a view of the underside of the presser-head.

The crank-'handle A is provided with a handpiece, B, as usual, and atone end is a stock, O. having upon the exterior thereof a screwthread,over which the sleeve D is passed, and by the revolution of which thejaws E are brought together for clamping and holding the bit or othertool inserted between them. These jaws are usually groovedlongitudinally upon their adjacent faces. My improvement relates to themanner of connecting the inner ends of these jaws E to the stock C,sothat they are free to open and close in receiving and clamping theboring-bit or other tool. The

.x inner ends of these jaws E are globular, as

seen at 3, the diameter' being greater than the thickness of the jaw,and into the stock C diagonal recesses are made to pass in from theoutside of the stock and are of a size to receive the globular portions3ol' the jaws, the jaws themselves occupying the parallel-sided slotwithin the stock C, as usual. The inclined recesses that are formed inthe stock C are preferably made with a round or globular tool, and therecesses do not intersect each other within the stock; but there is aridge or projection, 7, left between the two recesses, so that the jawsE E cannot slide together at their inner ends,but are kept in theirproper places, and they can also be forced apart by the shank 6c of thetool that is inserted between them, the globular ends 3 slidingoutwardly in the inclined recesses.

Then the sleeve D is revolved to clamp the bit or other tool between thejaws E E, the inclined interior surface of such sleeve acts against theinclined exterior edges of the jaws E to press them upon the shank ofthe tool,as usual; but at the same time the sleeve D tends to give thesaid jaws E an endwise motion to 7o drive them inwardly, and theglobular ends sliding along the inclined bottoms of the recesses forcethe inner ends of the jaws toward each other, and thereby the tool isclamped uniformly and rapidly by the jaws, and it is not liable tobecome loose as the brace is rotated in using the tool, and the jawscannot draw forward, because the slot is not as wide as the globularends, except at the bottom portions of the slot.

I simplify the construction of the presserhead by turning in thecylindrical upper end ofthe bar A, forming thecrank-handle, the annulargroove l0, and I apply the tubular button-head II over this end of thebrace and 8 5 close the metal of the annular rib ll at the lower end ofthe button H into the an`- nular groove l0, so as to hold thebutton-head upon the end of the brace and prevent it falling off when inuse. The annular groove 10 9o may be so placed that the end portion orannular rib ll of the button H may be circumferentially pressed inwardlyinto such annular groove by any suitable dies, or the annular groove l()may be at a little distance from the end portion ofthe button H, asshown in Figs. and 6, so that the metal of the cylindrical portion ofthebutton H may be pressed as an annular rib into said groove by diesacting around the outside of said cylindrical portion. Ioo In eitherinstance the metalof the cylindrical port-ion of the button is closedcircumferentially into the groove sufficiently to hold the button uponthe end of the brace; but this is not to be done so firmly as to preventthe button-head turning freely upon the brace, and the button-head isrecessed at each side of the rib that is pressed into the groove, sothat the metal will not bind upon the round rod above or below thegroove. A wooden pressenhead, I, is recessed for receiving the circularupper end of the button-head H, and upon the top of this buttonhead areclaws 5 and 6, having laterally-projecting hooks, and there are recessesat 17 and 18 in the wooden presser-head I for the reception of theseclaws, so that after the button-head has been inserted into its recessand the hooks 5 and 6 passed into their recesses a partial revolution isgiven to the presser-head upon the button-head, so that thelaterally-projectinghooks or points ofthe claws penetrate into the woodof the presser-head, and the presser-head cannot be pulled off thebutton-head; but in order to prevent the one part being turned upon theother, so as to unhook the claws, I insert nails or tacks 9 into thenotches or holes provided in the disk portion of the button-head, whichnails, entering the wood, aid in connecting the parts, as well aseffectually preventing one part turning on the other.

I claim as my invention- I. The jaws E, having globular inner ends thatare of greater diameter than the thickness of the other portions of thejaws, in combina tion with the screwsleeve and the screw-stoek, the slotof which is widest at the inner end to receive the globular ends,substantially as specified.

2. rIlie combi11ation,with the brace A,of the button-head II at the endthereof, having claws 5 and 6, andthe presser-head I, recessed toreceive the bntton-head and the said claws, and the nails or tacks9,passing through openings in the button head into the presser-head, toprevent one part turning upon the other and insure a reliableconnection, substantially as set forth.

Signed by ine this fiOthlday of December, 1887.

J. TII. PEDERSEN.

IVitncsses:

GEO. T. PINCKNEY, WILLIAM G. Mo'r'r.

